Device and method for heating hydrogen storage canister

Abstract

A device for heating hydrogen storage canister includes a canister containing chamber for accommodation of at least one hydrogen storage canister, a catalyst bed arranged in the canister containing chamber for catalysis. A blowing device provides an air flow through an air flow leading pipe to a nozzle section which is connected with a heating gas drawing pipe to the catalyst bed. A heating fuel storage tank supplies heating fuel which is conveyed to the nozzle section through a heating fuel supplying pipeline, a coiled pipe and a heating fuel conveying pipe in sequence. When the air flow flows through the nozzle section, the heating fuel is drawn into the nozzle section to mix with the air flow, forming a heating gas. The heating gas is atomized by the nozzle section and flows to the catalyst bed where the heating gas is catalyzed to burn to generate a hot gas to heat the hydrogen storage canister.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to a heating technique of hydrogen storage canister, and in particular to a method for heating up hydrogen storage canister to discharge hydrogen. The present invention also relates to a device for performing the method.[0003]2. Description of the Prior Art[0004]A fuel cell system is a power-generating unit that generates electrical power energy through electrochemical reaction of hydrogen and oxygen. To perform electrochemical reaction, hydrogen gas and air are separately conveyed to the fuel cell system via hydrogen gas passage and air passage.[0005]Currently, a variety of ways are available for storage of hydrogen. Hydrogen can be stored in compressed gas form as compressing hydrogen, in liquid state as liquid hydrogen or in hydride form as metal hydride. Although a compressing hydrogen increases the gravimetric density of hydrogen, compressing hydrogen is an expensive process ...

AI Technical Summary

Benefits of technology

[0012]A further object of the present invention is to provide a high performance heating device for heating hydrogen storage canisters. The heating device generates heat rapidly by catalyzing the combustion of methanol in a catalyst bed, such that the hydrogen storage canisters contained in a canister containing chamber can be heated efficiently in short time.

[0013]A yet further object of the present invention is to provide a method for heating hydrogen storage canisters. Air and methanol are conveyed smoothly and mixed efficiently, and combusted to produce sufficient heat to raise the temperature of the hydrogen storage canisters within a short time.

Problems solved by technology

Although a compressing hydrogen increases the gravimetric density of hydrogen, compressing hydrogen is an expensive process and the compressed hydrogen gas still occupies a great amount of space.

In addition, the high pressure of compressed hydrogen is adverse to operation safety.

However, liquidization of hydrogen is a high energy consumption process.

However, magnesium alloy possesses a defect in practical use.

Magnesium alloy is able to release a high flux of hydrogen only when the temperature is high enough e.g. at 200˜300° C. Therefore, it is not appropriate and inefficient to use magnesium alloy in a system that does not comprise a powerful heating device to heat up the magnesium alloy.

However, it should be noted that the ability of the hydrogen storage alloy to charge and discharge hydrogen directly affects the performance of the fuel cell system.

Desorption of hydrogen is an endothermic process, and therefore, during discharging, the hydrogen storage alloy absorbs heat and causes a drop in temperature.

Both of the techniques are limited to use in some applications.

Practically, the use of the electrical heater consumes a substantial amount of power and raises the operation cost.

Besides, the heating rate is not fast enough.

The heating devices currently available are not capable to heat up rapidly to a high temperature.

On the other hand, the temperature of the heat waste from the proton exchange membrane fuel cell system is usually below 100° C. which is not hot enough for heating up the magnesium alloy based hydrogen storage alloy.

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